It depends on places. In the area I live, it is also the neo-hippie/neo-rural/green/alternative-left who are anti-mask. But that's very localised, we happen to have a huge proportion of those various tendencies, that other people roughly group together and call with the word for 'hairy' in the local dialect :-), and less right and far-right people than elsewhere.

It's a low risk, obviously, especially if you are up to date. But as much as I like hippy vegans (not being sarcastic!) I would still worry they are walking around as potential measles incubators. If they have religious objections to wearing a piece of cloth over their face they probably aren't too excited about vaccines.

It's way down the list of things to worry about nowadays, obviously. But still.

When I was a kid, everyone was catching it. That was just one of those diseases you catch once and then you are done with it.

It is so low-risk that doctors didn't even declare the cases as they were supposed to be. They just observed them in case it would turn bad. Watching well and treating the few difficult case well made it so that there was just around 5 deaths a year, amongst cohorts of 800.000 who almost all caught it. At the scale of my department, that would be one letal case every 80 years... Outdoor leisure kill more in half a week here, as it was noticeable after lockdown (as we were very lucky with Covid, there were more outdoor leisure related death in 4 days of reopening than Covid related death from 9 months of first wave. NB: it was unfortunately different with second wave)

The Measles vaccine is also a proxy for other behavior. Minimally, in the US, folks that aren't innoculated for measles probably aren't innoculated for mumps or rubella (as MMR is one vaccine), or other important vaccines altogether.

[1] https://web.archive.org/web/20161023051702/https://www.cdc.g...